COC(=O)c1c(O)c(C)cc(O)c1C(=O)c1c(O)ccc(-c2ccc3c(c2O)C(=O)C2=C(O)C[C@H](C)[C@@H](O)[C@]2(C(=O)OC)O3)c1O	secalonic acid H | versixanthone I